This document discusses rules for forming the past tense of verbs in English. Verbs with short vowels before a single consonant will double that consonant when adding "-ed", like "fit" becoming "fitted". Verbs with two consonants or without a short vowel sound do not double, so words like "stamp" become "stamped" and "look" becomes "looked". The document then provides a list of verbs to write in the past tense form.

1. 1
Words with short vowels need to apply the doubling rule before adding
<ed>.
fit fitted slip slipped skip skipped
clap clapped grab grabbed
Words with two consonants has a wall, so they don't apply the doubling
rule.
stamp stamped
Words that do not have short vowel sounds do not need a wall, and so do
not need to double the last consonat.
look looked play played bark barked

2. 2
bat
Write this verbs in the simple past tense.
hop pat
rip nod peg
hug wag hum